public  void doTest(String jspName) throws Exception 
{
        ParamEncoder encoder = new ParamEncoder("table");
        String mediaParameter = encoder.encodeParameterName(TableTagParameters.PARAMETER_EXPORTTYPE);
        WebRequest request = new GetMethodWebRequest(jspName);
        request.setParameter(mediaParameter, Integer.toString(MediaTypeEnum.XML.getCode()));
        // save previous level, since we are expeting an excetion I don't want to fill logs
        Level previousLevel = Logger.getLogger(TableTag.class).getLevel();
        Level previousLevelEL = Logger.getLogger(ELTableTag.class).getLevel();
        try
        {
            // disable log
            Logger.getLogger(TableTag.class).setLevel(Level.OFF);
            Logger.getLogger(ELTableTag.class).setLevel(Level.OFF);
            // check if page need a filter (unfiltered request)
            runner.getResponse(request);
            fail("Request works also without a filter. Can't test it properly.");
        }
        catch (HttpInternalErrorException e)
        {
            // it's ok
        }
        // reset log
        Logger.getLogger(TableTag.class).setLevel(previousLevel);
        Logger.getLogger(ELTableTag.class).setLevel(previousLevelEL);
        request = new GetMethodWebRequest(jspName);
        request.setParameter(mediaParameter, Integer.toString(MediaTypeEnum.XML.getCode()));
        // this enable the filter!
        request.setParameter(TableTagParameters.PARAMETER_EXPORTING, "1");
        WebResponse response = runner.getResponse(request);
        assertEquals("Expected a different content type.", "text/xml", response.getContentType());
}

 public String getJspName() 
{
        return "filter.jsp";
}